Wellcome Bienvenue Willkommen Bienvenido UFM 610 The Transit

Wellcome Bienvenue Willkommen Bienvenido Добро пожаловать ようこそ歡迎 UFM 610

The Transit Time Clamp-on Flow Metering Technique

Introduction • Principle of operation. • Modes of operation. • Installation guidelines.

Principle of operation • The general principle of time of flight flow measurement. • The phase measurement system. • Modes of operation Sensor Block A Flow Sensor Block B Liquid

The general principle of time of flight flow measurement. Approximate relationship between fluid velocity and measured time. Does not include clamp on transducer delays. Vf l Cf t Kn = = = Flow velocity Distance between transducers Path length between transducer faces Transit-time downstream Profile correction factor Propagation angle

Typical sound path for a clamp on ultrasonic meter Pipe cut through side view Transducers Steel Plastic Line represents path of sound wave Water

The direct time measurement system

Modes of operation Sensor Block A Sensor Block B A Pipe wall Flow Liquid Flow Pipe wall Sensor Block Reflex mounting • ease of setup • good results over a broad range of applications B Diagonal mounting • extends the readable pipe diameter for given sensors • better for high flows • better with turbulent applications

Modes of operation Sensor Block A Flow Sensor Block B A Liquid Pipe wall Double reflex mounting • ease of setup • useful for smaller pipe diameters • good on low flow rates Flow Sensor Block B Liquid Pipe wall Triple reflex mounting • ease of setup • useful for smaller pipe diameters • good on low flow rates